The WA senator reportedly billed out $23,000 for trips to Broome.

Finance Minister Mathias Cormann has been caught up in the MP expenses scandal.

Finance Minister Mathias Cormann is the latest federal government MP to be caught up in the political entitlements scandal after reports he claimed more than $23,000 for trips to the resort town of Broome.

Fairfax Media reports that WA sentaor Cormann and his wife made five taxpayer-funded trips to Broome on weekends for electorate business between 2010 and 2014.

A spokeswoman for Senator Cormann told Fairfax that all claimed expenses for trips to Broome were legitimate, saying as a senator his job involved travel across his "very large electorate".

"Inevitably, much of the travel and attendance at functions and events in the electorate, whether in Perth or across regional WA, occurs Fridays to Sundays, when Senator Cormann has returned back to his home state from interstate parliamentary work commitments," the spokeswoman is quoted as saying.